Willson, Robert Wheeler, 1853-1922 · Boston, New York Ginn & company · leaf 26
cular protractor iu such a position that the line of the true meridian on the hemispherecoincides with the zero line of the protractor. Place the altitude arc so as to measure the altitude at any part ofthe suns path west of the meridian (Fig. 16). The reading of thefoot of the arc will give the… … FlQ. 15 bearing by the declination of the compass, being evidently less thanthe magnetic bearing, if the declination is west of north. It is alsocalled the azimuth of the suns vertical circle, or, briefly, of the sun.
Astronomy
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